I have a James Cox in my line, so I thought I would share. I'm still working on the Coxes in my lines, as they are intertwined in both my husband's and my side. So, my information may be incomplete, but I've tried to source everything I've got. They have been quite a task to undertake!

Mary Ann Cooley (William Henry Cooley x Sophia Susan Havens), b. 1822, Washington Co., Ohio - d. May 19, 1807, Clark Co., IL.
married James Cox (b. abt. 1819, Ohio) on 28 Apr 1849 in Crawford Co., IL.

Children:
Elizabeth Jane Cox, b. July 1850, Illinois
Jamima Cox, b. abt. 1861, Illinois

Notes: by dates, this COULD be the James Cox mentioned in the History, as Mary's father, William was also one of the first settlers of Licking Twp. about the same time. However, I found NO sons, and I cannot verify that this is the same family. There are SEVERAL Cox families in the area, and so far, I cannot link them all together. So, until I have proof otherwise, I am going to say this is a different family.

References:
1850 Census: Crawford County, Illinois - Film no. M432-104, p. 194b
1860 Census: Twp. 5, Range 5, Clay County, Illinois - Film no. M653-162, p. 0, image 630
1870 Census: Pixley, Clay County, Illinois -Film no. M593-196, p. 142, image 286
Illinois State Archives, Illinois Statewide Marriage Index, 1763 - 1900, volume 00A, page 0115, license no. 00001316, Crawford County.